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<p>Microbial communities play indispensable roles in the biogeochemical cycling of river ecosystems. However, the response patterns of microbial community diversity, niche breadth, and assembly to rainfall disturbances in complex mountainous riverine reservoirs remain inadequately understood. We employed high-throughput sequencing of 16S and 18S ribosomal RNA genes, along with multivariate statistical methods to systematically investigate prokaryotic and eukaryotic microorganisms in the riverine Zhaoshandu Reservoir, Wenzhou, Zhejiang, East China. Results show significant temporal heterogeneity in both prokaryotic and eukaryotic microbial communities, with eukaryotic microbes showing more pronounced temporal variation. Canonical correspondence analysis revealed that rainfall and water temperature were the key drivers shaping microbial communities. Additionally, eukaryotic microorganisms exhibited a more pronounced response to rainfall and water temperature compared to prokaryotes. Modified stochasticity ratio model indicated that deterministic processes predominantly governed microbial community assembly, with stronger deterministic processes in eukaryotic compared to prokaryotic microorganisms. Rainfall has significantly altered water quality, notably increasing phosphorus concentration in the water column. Total phosphorus and total nitrogen showed significant correlations with the niche breadth of prokaryotic and eukaryotic microorganisms, and phosphorus nutrients served as keystones and playing indispensable roles in their co-occurrence networks. A structural equation model confirmed the notable impacts of rainfall and water temperature on microbial community diversity, further revealing that rainfall indirectly influenced the niche breadth and co-occurrence relationships of microbial communities by altering phosphorus concentrations. The findings underscore the influence of rainfall and water temperature on microbial distribution, highlighting the sensitivity of riverine reservoir ecosystems to climate change.</p>

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Rainfall and water temperature co-drive changes in structure and assembly of prokaryotic and eukaryotic communities in a subtropical riverine reservoir

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Qihang Zhao,
  • Jun Zuo,
  • Baiyu Cui,
  • Xinyue Ren,
  • Xiang Hu,
  • Tianchi Sun,
  • Zeshuang Wang,
  • Peng Xiao,
  • He Zhang,
  • Renhui Li

摘要

Microbial communities play indispensable roles in the biogeochemical cycling of river ecosystems. However, the response patterns of microbial community diversity, niche breadth, and assembly to rainfall disturbances in complex mountainous riverine reservoirs remain inadequately understood. We employed high-throughput sequencing of 16S and 18S ribosomal RNA genes, along with multivariate statistical methods to systematically investigate prokaryotic and eukaryotic microorganisms in the riverine Zhaoshandu Reservoir, Wenzhou, Zhejiang, East China. Results show significant temporal heterogeneity in both prokaryotic and eukaryotic microbial communities, with eukaryotic microbes showing more pronounced temporal variation. Canonical correspondence analysis revealed that rainfall and water temperature were the key drivers shaping microbial communities. Additionally, eukaryotic microorganisms exhibited a more pronounced response to rainfall and water temperature compared to prokaryotes. Modified stochasticity ratio model indicated that deterministic processes predominantly governed microbial community assembly, with stronger deterministic processes in eukaryotic compared to prokaryotic microorganisms. Rainfall has significantly altered water quality, notably increasing phosphorus concentration in the water column. Total phosphorus and total nitrogen showed significant correlations with the niche breadth of prokaryotic and eukaryotic microorganisms, and phosphorus nutrients served as keystones and playing indispensable roles in their co-occurrence networks. A structural equation model confirmed the notable impacts of rainfall and water temperature on microbial community diversity, further revealing that rainfall indirectly influenced the niche breadth and co-occurrence relationships of microbial communities by altering phosphorus concentrations. The findings underscore the influence of rainfall and water temperature on microbial distribution, highlighting the sensitivity of riverine reservoir ecosystems to climate change.